Neowin.net posted a news story that Microsoft has invited iPhone jailbreaker George Hotz to trying out Windows Phone 7

Microsoft has displayed some very surprising reactions to those wanting to hack the Windows Phone 7 devices. It may be that since it is legal to jailbreak your phone they are embracing something they can no longer fight. Microsoft has invited famous iPhone jailbreaker Geohot to have a stab at jailbreaking Windows Phone 7 devices.

  Microsoft inviting iPhone jailbreaker to give WP7 a try